You have a point but there is also quite a bit of churn in the billionaire ranks. So if you include all that have been billionaires in the last 10 - 20 years yo

You have a point but there is also quite a bit of churn in the billionaire ranks. So if you include all that have been billionaires in the last 10 - 20 years you'll have many more than just 2,000. And for practical purposes, having $500 million vs. $1 billion is really the same league of wealth. So if we make the criterion $500 million my point is absolutely true! 5,000 at any given time vs 480.